Question
Chemistry Question on p -Block Elements
Holme?? signal uses chemical compound
A
calcium carbide
B
calcium phosphide
C
calcium carbide and calcium phosphide
D
calcium carbide and aluminium carbide
Answer
calcium carbide and calcium phosphide
Explanation
Solution
Holmes signal uses calcium carbide and calcium phosphide. The spontaneous combustion of phosphine is technically used in Holmes signals. Containers containing a mixture of calcium carbide and calcium phosphide are pierced and thrown in the sea when the gases burn and serve as a signal.